阅读说明：本技术 一种超临界二氧化碳印染工艺及其印染系统 (Supercritical carbon dioxide printing and dyeing process and printing and dyeing system thereof ) 是由 杨景峰 于 2019-10-11 设计创作，主要内容包括：本发明公开了一种超临界二氧化碳印染工艺及其印染系统,包括步骤：(1)将液态二氧化碳转换为超临界二氧化碳；(2)将超临界二氧化碳与染料混合形成染液；(3)将染液通入染色釜中,并在超声波和双向循环的作用下对来自进锭端的纱锭进行染色；(4)收集染色后的剩余染液并进行减压、分离处理,分离后的染料和超临界二氧化碳分别经净化、干燥后进行循环利用。本发明的印染工艺及其印染系统,无染色废水及其它废弃物产生,可实现绿色环保、清洁生产,经济效益好、环境效益显著的特点,可实现循环利用、流水生产、提高产量、降低工业成本的目的。(The invention discloses a supercritical carbon dioxide printing and dyeing process and a printing and dyeing system thereof, comprising the following steps: (1) converting the liquid carbon dioxide to supercritical carbon dioxide; (2) mixing supercritical carbon dioxide and a dye to form a dye solution; (3) introducing the dye solution into a dyeing kettle, and dyeing the spindle from the spindle feeding end under the action of ultrasonic waves and bidirectional circulation; (4) collecting the residual dye liquor after dyeing, decompressing and separating, and respectively purifying and drying the separated dye and supercritical carbon dioxide for recycling. The printing and dyeing process and the printing and dyeing system thereof have the advantages of no generation of dyeing wastewater and other wastes, realization of green environmental protection and clean production, good economic benefit and remarkable environmental benefit, and can realize the purposes of cyclic utilization and flow production, yield improvement and industrial cost reduction.)

1. a supercritical carbon dioxide printing and dyeing process is characterized by comprising the following steps:

(1) After pressurization and heating treatment, liquid carbon dioxide is converted into supercritical carbon dioxide;

(2) mixing supercritical carbon dioxide and a dye to form a dye solution;

(3) introducing the dye solution into a dyeing kettle, dyeing the spindle from the spindle inlet end under the action of ultrasonic waves and bidirectional circulation, and sending out the spindle from the spindle outlet end after the spindle is dyed to be mature;

(4) And (3) collecting the residual dye liquor after dyeing, decompressing and separating, and respectively purifying and drying the separated dye and supercritical carbon dioxide to be used as the liquid carbon dioxide raw material in the step (1) and the dye raw material in the step (3) for recycling.

2. The supercritical carbon dioxide printing and dyeing process according to claim 1, characterized in that in step (1) a pressurizing unit is used to pressurize the carbon dioxide pressure to above 16 MPa; the carbon dioxide is heated to a temperature above 80 ℃ by the heating unit.

3. The supercritical carbon dioxide printing and dyeing process according to claim 1, characterized in that step (2) further comprises adding a dyeing assistant to the dye liquor.

4. The supercritical carbon dioxide printing and dyeing process according to claim 1, characterized in that in step (3), an ultrasonic wave generating unit with the working power of 600W is adopted to carry out ultrasonic treatment on the dye liquor and the spindle in the dyeing kettle; and (3) circulating the dye liquor in the dyeing kettle at the speed of 2.4m/min by adopting a bidirectional circulating pump, and advancing the spindle in the dyeing kettle at the amplitude of 1.2m/min for dyeing.

5. The supercritical carbon dioxide printing and dyeing process according to claim 1, further comprising the step of (3) performing heat preservation and insulation treatment on the dyeing kettle during dyeing.

6. A supercritical carbon dioxide printing system according to the process of any one of claims 1 to 5, comprising: CO 2₂Holding vessel, dye jar, dyeing cauldron, dyestuff collection tank, decompression cooling unit and extraction separating unit, wherein:

The CO is₂The storage tank is connected with the dye tank sequentially through a pipeline filtering unit, a drying unit, a heating unit and a pressurizing unit so as to enable the CO to be in contact with the dye tank₂The carbon dioxide in the storage tank is converted into supercritical carbon dioxide after pressurization and heating treatment, and the supercritical carbon dioxide is introduced into the dye tank and mixed with the dye to form dye liquor;

The dyeing tank is connected with the dyeing kettle through an auxiliary agent tank and a flowmeter in sequence through a pipeline and is used for feeding the dye liquor into the dyeing kettle to dye spindles from a spindle feeding end, and the dyeing kettle is provided with at least one dual-core ultrasonic generating device and at least one bidirectional circulating pump;

The bottom of the dyeing kettle is connected with the decompression cooling unit through the dye collecting tank through a pipeline so as to collect the residual dye liquor dyed in the dyeing kettle in the dye collecting tank, and the decompression and separation treatment is carried out on the residual dye liquor through the decompression cooling unit;

the top end of the decompression cooling unit is connected with the CO sequentially through a purification unit, a filtering unit and a drying unit through pipelines₂a storage tank for feeding the separated carbon dioxide gas to the CO₂the storage tank is recycled; and

The bottom end of the decompression cooling unit is connected with the extraction separation unit through a pipeline so as to extract the separated dye liquor, the extracted dye is sent into the dye tank for recycling, and/or the extracted auxiliary agent is sent into the auxiliary agent tank for recycling.

7. The supercritical carbon dioxide dyeing and printing system according to claim 6, wherein the dyeing vessel is composed of a 24-25 m pipeline, and a heat insulating layer, four ultrasonic wave generating units and four bidirectional circulating pumps are arranged on the dyeing vessel.

8. The supercritical carbon dioxide printing and dyeing system according to claim 6, wherein liquid inlet holes are respectively arranged at positions 1000mm, 3000mm, 5000mm and 6000mm away from the dyeing kettle, and the liquid inlet holes are connected with the dyeing tank through a spindle outlet end pipeline.

9. the supercritical carbon dioxide printing and dyeing system according to claim 6, wherein liquid discharge holes are respectively arranged at 375mm, 625mm, 875mm and 1125mm from the spindle outlet end of the dyeing kettle, and the liquid discharge holes are connected with the dye collecting tank through pipelines.

10. The supercritical carbon dioxide printing and dyeing system according to claim 8 or 9, wherein the liquid discharge hole and the liquid inlet hole are in a large-small head structure, and each hole is composed of an upper hole and a lower hole, the upper hole has a height of 20-30mm and a diameter of 25-30 mm; the height of the lower hole is 8-12mm, and the diameter is 3-8 mm.

Technical Field

The invention relates to the technical field of printing and dyeing, in particular to a supercritical carbon dioxide printing and dyeing process and a printing and dyeing system thereof.

Background

The existing supercritical carbon dioxide printing and dyeing process only realizes semi-continuity, and a dyeing kettle does not have heat preservation and insulation measures, so that a large amount of heat is lost in the process flow; only a one-way circulating pump is arranged in the dyeing process, so that the dyeing uniformity of the product has certain problems; the existing dyeing auxiliary agent does not achieve the best dyeing assisting effect; the existing supercritical carbon dioxide printing and dyeing process is not effectively combined with the action of ultrasound; the residual dye liquor is not recycled, which can realize continuous and cyclic production, and the factors cause that the prior supercritical carbon dioxide printing and dyeing process is in the states of low efficiency, large energy consumption, high cost and low benefit, and the problems of substandard product uniformity and long equipment exist.

Therefore, it is necessary to develop a process which can realize green environmental protection, clean production, recycling, high yield and low cost.

Disclosure of Invention

The invention provides a supercritical carbon dioxide printing and dyeing process and a printing and dyeing system thereof to solve the problems in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

The invention provides a supercritical carbon dioxide printing and dyeing process, which comprises the following steps:

(1) After pressurization and heating treatment, liquid carbon dioxide is converted into supercritical carbon dioxide;

(2) Mixing supercritical carbon dioxide and a dye to form a dye solution;

(3) introducing the dye solution into a dyeing kettle, dyeing the spindle from the spindle inlet end under the action of ultrasonic waves and bidirectional circulation, and after the spindle is dyed to be mature, sending the spindle out from the spindle outlet end to enter the next process;

(4) And (3) collecting the residual dye liquor after dyeing, decompressing and separating, and respectively purifying and drying the separated dye and supercritical carbon dioxide to be used as the liquid carbon dioxide raw material in the step (1) and the dye raw material in the step (3) for recycling.

Further, in the step (1), a pressurizing unit is adopted to pressurize the pressure of the carbon dioxide to be more than 16 MPa; the carbon dioxide is heated to a temperature above 80 ℃ by the heating unit.

Further, the step (2) also comprises adding a dyeing assistant into the dye solution.

Further, in the step (3), an ultrasonic wave generating unit with the working power of 600W is adopted to carry out ultrasonic treatment on the dye liquor and the spindle in the dyeing kettle; and (3) circulating the dye liquor in the dyeing kettle at the speed of 2.4m/min by adopting a bidirectional circulating pump, and advancing the spindle in the dyeing kettle at the amplitude of 1.2m/min for dyeing.

further, the step (3) also comprises the step of carrying out heat preservation and insulation treatment on the dyeing kettle in the dyeing process.

a second aspect of the invention provides a supercritical carbon dioxide printing system as described in the process comprising: CO 2₂Holding vessel, dye jar, dyeing cauldron, dyestuff collection tank, decompression cooling unit and extraction separating unit, wherein:

The CO is₂The storage tank is connected with the dye tank sequentially through a pipeline filtering unit, a drying unit, a heating unit and a pressurizing unit so as to enable the CO to be in contact with the dye tank₂the carbon dioxide in the storage tank is converted into supercritical carbon dioxide after pressurization and heating treatment, and the supercritical carbon dioxide is introduced into the dye tank and mixed with the dye to form dye liquor;

The dyeing tank is connected with the dyeing kettle through an auxiliary agent tank and a flowmeter in sequence through a pipeline and is used for feeding the dye liquor into the dyeing kettle to dye spindles from a spindle feeding end, and the dyeing kettle is provided with at least one dual-core ultrasonic generating device and at least one bidirectional circulating pump;

The bottom of the dyeing kettle is connected with the decompression cooling unit through the dye collecting tank through a pipeline so as to collect the residual dye liquor dyed in the dyeing kettle in the dye collecting tank, and the decompression and separation treatment is carried out on the residual dye liquor through the decompression cooling unit;

The top end of the decompression cooling unit is connected with the CO sequentially through a purification unit, a filtering unit and a drying unit through pipelines₂A storage tank for feeding the separated carbon dioxide gas to the CO₂the storage tank is recycledutilizing; and

the bottom end of the decompression cooling unit is connected with the extraction separation unit through a pipeline so as to extract the separated dye liquor, the extracted dye is sent into the dye tank for recycling, and/or the extracted auxiliary agent is sent into the auxiliary agent tank for recycling.

furthermore, the dyeing kettle is composed of a pipeline of 24-25 meters, and a heat insulation layer, four ultrasonic wave generating units and four bidirectional circulating pumps are arranged on the dyeing kettle.

Furthermore, liquid inlet holes are respectively formed in positions 1000mm, 3000mm, 5000mm and 6000mm away from the ingot outlet end of the dyeing kettle, and the liquid inlet holes are connected with the dyeing tank through pipelines.

Furthermore, liquid discharge holes are respectively formed at positions 375mm, 625mm, 875mm and 1125mm away from the spindle outlet end of the dyeing kettle, and the liquid discharge holes are connected with the dye collecting tank through pipelines.

further preferably, the liquid discharge hole and the liquid inlet hole are in a large-small head structure and both consist of an upper hole and a lower hole, the height of the upper hole is 20-30mm, and the diameter of the upper hole is 25-30 mm; the height of the lower hole is 8-12mm, and the diameter is 3-8 mm.

by adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

(1) 4 bidirectional circulating pumps are configured to complete a group of forward and reverse circulation in 4-5 minutes, so that the dyeing uniformity of the product is improved; meanwhile, 4 same-frequency ultrasonic waves are additionally arranged, so that the activity of dye molecules and dyeing assistant molecules is improved, the diffusion and adsorption processes of the dye molecules are accelerated, and the dyeing efficiency is improved;

(2) by adding the auxiliary agent into the dissolved dye solution, the dyeing process can be faster, and the spindle has stronger adsorption to the dye; one spindle can be successfully dyed within 30min, and the spindle enters the product collecting trolley from the spindle outlet end at the time interval of about 18 seconds;

(3) Adding a residual dye solution collector at the spindle outlet end, respectively opening holes at positions 375mm, 625mm, 875mm and 1125mm away from the spindle outlet end to be connected with the residual dye solution collector to collect residual dye solution, separating supercritical carbon dioxide from dye and auxiliaries by a decompression separation device, separating the dye from the auxiliaries by an extraction mode, respectively purifying and drying the supercritical carbon dioxide, the dye and the auxiliaries, and circulating the purified and dried dye and auxiliaries to a raw material bin; the process for printing and dyeing by using the supercritical carbon dioxide can realize green, environment-friendly, clean production, recycling, high yield and low cost;

(4) The pressure born by the supercritical carbon dioxide printing and dyeing process and the supercritical carbon dioxide printing and dyeing system is reduced by 30-46%, and compared with the printing and dyeing temperature of common equipment, the supercritical carbon dioxide printing and dyeing process and the supercritical carbon dioxide printing and dyeing system reduce by 25-33%, so that the equipment cost and the heat supply cost are greatly reduced; compared with the printing and dyeing efficiency of the existing process equipment, the printing and dyeing efficiency is improved by 16-33%; in addition, due to the configuration of the dual-core ultrasonic wave, dyeing is more uniform, the color difference of inner and outer coils is greatly reduced, and the color fastness of the fabric is improved to be up to 5 levels.

drawings

FIG. 1 is a schematic diagram of a supercritical carbon dioxide printing and dyeing system according to the present invention;

FIG. 2 is a schematic structural diagram of a dyeing kettle in a supercritical carbon dioxide printing and dyeing system according to the present invention;

FIG. 3 is a schematic view of a partially enlarged structure of the dyeing kettle shown in FIG. 2;

FIG. 4 is a schematic structural diagram of a spindle outlet end of a dyeing kettle in the supercritical carbon dioxide printing and dyeing system according to the present invention;

FIG. 5 is a schematic view of a partially enlarged structure of a drain hole at the spindle outlet end of the dyeing kettle shown in FIG. 4.

Detailed Description

The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.